sky_day01_05 custom skybox appears twice

So I was making a skybox replacement pack,the first was fine but with the second,the textures for the sides of sky_day01_05 specifically appear twice-once at the bottom,once at the twice instead of being a single texture.The textures I’m using are 2048x2048 pixels so it should be absolutely fine,other textures did for other skyboxes but sky_day01_05 only chooses to act weird.I assume I need a special .vmt but I don’t know what to put in it if I do.If this happened to you,what would you do?Thanks for your time

Look at the size and texture flags of the original textures.